| Abbreviation | Definition |
|---|---|
| AYF | American Youth FB |
| AYF | American Youth Football |
| AYF | American Youth Foundation |
| AYF | Anglican Youth Fellowship |
| AYF | Arewa Youth Forum |
| AYF | Asian Youth Fellowship |
| AYFS | Adolescent and Youth Friendly Services |
| AYFS | Adolescent Youth Friendly Services |
| AYFS | Alpha Youth Film Series |
| AYFS | American Youth Football of Samoa |
| AYFS | Auburn Youth and Family Services |
| AYH | Adolescent and Youth Health |
| AYH | Amherst Youth Hockey |
| AYI | African Youth Initiative |
| AYIG | Australian Youth Invitational Games |
| AYL | Adrenaline Youth Leagues |
| AYL | African Youth League |
| AYL | Albemarle Youth League |
| AYL | Arapahoe Youth League |
| AYL | Arapahoe Youth Leagues |